Processing digital data

Inactive Publication Date: 2006-06-29
SONY EUROPE BV
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  • Abstract
  • Description
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  • Application Information

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Benefits of technology

[0024] The compression reduces the amount of data and the encryption transforms the compresse

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  • Processing digital data
  • Processing digital data
  • Processing digital data

Examples

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Example

[0075] In the Figures, like elements are denoted by like reference signs.

[0076] The present invention is described in the following by way of example with reference to audio signals.

[0077] Compression and Encryption of Audio Files

[0078] Referring to FIG. 1, a source 1 of original digital audio is provided. The audio in this example is in the form of a file. The digital audio is uncompressed in any suitable format, for example, PCM, WAV, AIFF (Audio Interchange File Format). The digital audio may be in fixed point format or in floating point format. The following description assumes fixed point format, although a section below comments on floating point format. The source may be any suitable source, and in this example may be a computer. The original digital audio is compressed by a compressor 2, which implements a standard lossless compression algorithm to produce a compressed audio file. It will be appreciated that other compression algorithms may be used. The compression achiev...

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Abstract

An original digital audio signal represents unimpaired audio information. The digital audio signal is compressed and encrypted without substantial impairment to produce a first audio signal. A second, unencrypted, audio signal is produced. The first and second audio signals are combined. Preferably the first audio signal is losslessy compressed. The second audio signal may be an impaired version of the original digital audio signal.

Description

BACKGROUND TO THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to: a method of processing digital data; apparatus for processing digital data; a computer program for processing digital data; a data format; a method and apparatus for restoring the processed data; and a corresponding program. Some aspects and embodiments of the invention relate to processing audio signals, but it will be appreciated that in other aspects and embodiments the invention may be applied to other data. The other data may be audio / visual data, video data, still image data, a computer program, and multimedia data amongst other examples. [0003] 2. Description of the Prior Art [0004] EP-A-1,189,372 (Matsushita) discloses many techniques for protecting audio signals from misuse. In one technique, audio is compressed and encrypted before distribution to a user. The user needs a decryption key to access the audio. The key may be purchased by the user to access the audio. The audi...

Claims

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Application Information

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IPC IPC(8): G10L21/00G06F21/10G06F21/60G06F21/62G10L19/00G11B20/00G11B20/10G11B20/12
CPCG11B20/00007G11B20/00086G11B20/00826G11B20/10527
Inventor DENSHAM, RODNEY HUGHCRANSTOUN KENTISH, WILLIAM EDMUNDHAYNES, NICHOLAS JOHNEASTLY, PETER CHARLES
Owner SONY EUROPE BV
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